Displaying 13 results of Cyclophosphamide Stable Isotopes Cyclophosphamide is a chemotherapy drug used to treat various types of cancer and autoimmune diseases. Stable isotopes of cyclophosphamide are non-radioactive forms of the drug that have the same chemical properties as the standard version but are labeled with heavier isotopes. These isotopes are used in research and drug development to study drug metabolism, pharmacokinetics, and drug interactions. They are also used as internal standards in analytical methods for quantification of cyclophosphamide in biological samples.